Fluid-dispensing pump



Dec 9, 1924.

A/ G MCGALIN FLUID DISPENSING PUMP Filed June 9, 1922 INVENTQR A MQ4//ff V. B H m/ a, A n ,M5 IEX I Q@ J0 a M 4 o 5 7 5 w Patented Dec. 9,1924.

UNITED STATES A Gr MGGALI'N, vOF DALLAS, TEXAS.

FLUID-DISPENSING PUMP.

Application filed June 9,

To all whom t may concern:

Be it known that I, A Gr MCGALIN, a citi- Zen of the United States,residing at Dallas, in the county of Dallas and State of Texas, haveinvented certain new and useful 'Improvements in Fluid-Dispensing Pumps;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the figures of'reference markedthereon, which form a part of this specification.

This invention relates to 'Huid dispensing pumps particularly applicablefor use in dispensing gasoline at the so-called filling stations and theprimary object of the invent-ion is to provide a measuring pump whichmay be continuously operated to discharge a given quantity of liquid,for eX- ample, gasoline, for each complete movement of the piston.

It is one of the purposes of my invention to simplify the measuringdispensing pump construction so that the pump may be caused to dischargea given quantity of gasoline for each alternating movement of thepiston. That is, on the forward stroke of the piston,

a given quantity of gasoline will be discharged and on the returnmovement of the piston, a like quantity will be discharged, therebyinsuring a continuous stream of liq- V uid from the pump during the timethat the piston mechanism is being operated.

To this end I prefer to drive the piston from a crank and gearmechanism, the construction being such that itwill not be necessary toreverse the direction of the cranking device in order to fill up themeasuring chamber. When one side of the measuring chamber isdischarging, the other side will be filling, the piston being adouble-acting'V one. This is an important feature of my invention as itfacilitates the dispensing of the gasoline in a more satisfactory mannerthan is accomplished by known types of pumps now on the market.

In general appearance the pump may foly low that of t-he ordinarydispensing pump and it may combine the advantages of a visible and blindpump. The usual pump stand will be above the ground with the crank`easily accessible.

The general construction of the device as 1922. Serial N0. 567,061.

well as the novel details of the parts included in the illustratedembodiment of the invention will be well understood by reference to thefollowing description in connection with the accompanying drawings, inwhich- Fig. 1 is a view partly in longitudinal section and partiy inelevation of a dispensing pump mechanism constructed in accordance withmy invention, and' Fig. 2 is a view of the gearing mechanism foroperating the pump piston, parts being shown in section.

Referring now to the drawings,

1 designates a pump stand which, may be of any appropriate constructionand at the lower part of the pump stand are shown two cylinder supports2 and 3, to which are secured t-he respective ends of a measuringchamber or cylinder 4. The bottom of the measuring chamber or cylinder lcommunicat'es with an inlet pipe 5, the pipe communicating with a sourceof supply as, for example, a tank which may be submerged in the ground,as is well understood.

The top of the cylinder l communicates with the pipe 5 through a branchpipe 6. An inwardly openingcheck valve 7 is provided in the pipe 5,which opens to permit fluid to pass into the lower partof the cylinder 1but which will close under the pressure from the cylinder. A check valve8 is provided in the pipe 6, which will operate to allow `fluid to passinto the cylinder but which. will seat when pressure is exerted againstit from the cylinder so that liquid from the cylinder may not pass backinto the pipe 6; The construction of these check valves is wellunderstood so it is thought unnecessary to illustrate them in detailhere.

Working in the cylinder or measuring. chamber 4 is adouble-acting piston9, having piston leathers 10 and 11 working in opposite directions toseal ofi' the upper portion 12 from the lower portion 13, thus dividingthe cylinder into an upper chamber and a lower chamber, the purpose ofwhich will be presently explained.

The piston 9 is provided with a piston rod 14, passing through astulling box. 15 in the top of the cylinder et and connected to a link16, carried by the wrist pin 17 on the disk 18. The disk 18 is providedwith a stub shaft 1S) mounted in a bearing 2() in the standard 21supported by the plate 22 in the stand 1. The stand is so provided witha bearing 23, in which is a crank shaft 24 extending through the standand carrying a hand crank 25, whereby the shaft 24 can be rotated. Theshaft 24 is recessed to receive the restricted end or pin 26,constituting the end of the shaft 19 so that the end of the shaft 24constitutes a bearing for the end of the shaft 19.

The shaft 24 carries a pinion gear 27, which meshes with a gear 28 on ashaft 29 in bearings 30 and 31 in the standard 21 and stand 1respectively. The shaft 29 also carries a pinion gear 32, which mesheswith a gear 33 rigid on the shaft 19 which carries a disk 18. Therefore,the train of gears just described are so arranged that when the crankshaft 24 is rotated, motion will be imparted to the shaft 19 through thetrain, the ratio of the gears being shown as about four to 1.

Vhen the disk 18 is rotated, obviously a reciprocatory motion will beimparted to the piston 9. When the piston moves up, it will draw liquidthrough the pipe 5 into the lower portion 13 of the cylinder 4; itcannot force the liquid out through the pipe 6 because the valve 8 willprevent it. The upward movement of the piston 9, however, will force theliquid above it through the pipe 34, connected to the top of thecylinder 4 and discharge it into the bottom of the cylinder 35 supportedby and constituting part of the stand 1.

The cylinder 35 may consist of the upper and lower heads 36 and 37 witha transparent circular wall fastened thereto, as shown, so that thecontents of the cylinder 35 will be visible. The wall will preferably beof glass and it may be protected by a screen 38, as seen in Fig. 1.These are immaterial details, however.

The pipe 34 is provided with a check valve 39, which will open in thedirection of the cylinder 36 but which will close when preslsure isapplied from above.

The bottom head 37 of the cylinder is also provided with an outlet 40,to which is connected a flexible hose or pipe 41, as will be wellunderstood, with a suitable nozzle to supply the motor vehicle tankswithy gasoline. The nozzle may be normally held on a bracket 42 when thepump is not in operation. The outlet 40 is provided with an outwardlyopening check valve 43, as clearly seen in Fig. 1. Y

The upper head 36 is provided with an inwardly opening check valve 44 inthe end of the pipe 45, which connects with a discharge orifice 46. Thevalve 44 will open when yliquid is supplied from the chamber 13 to thepipe 45 but it will be closed against back pressure The top or upperhead 36 is vprovided with a discharge orifice 47, in which is anoutwardly opening check valve 48 and.

a pipe leading from the orilice 47 to the discharge conduit or pipe49which communicates the hose 41 with the discharge orifice 40.

There is a double-acting piston 50 in the cylinder 35 and it has apiston rod 51 passing through the stuiiing box 52 in the lower head 37and adjustably connected to the yoke-shaped upper end 53 of the rod 14by an adjusting nut 53', in effect providing a fixed relation betweenthe pistons 9 and 50. Therefore, when the piston 9 moves upwardly, thepiston 50 will move upwardly and vice versa.

ln the top of the stand I may 'provide a sign or transparent,translucent or semiopaque globe 54, within which may be an electriclight to make an attractive sign. This,'however, is not a necessary partof my invention, the essential parts of the invention residing in thepeculiar manner of operating the pump as well as the constructionsthereof and their relation one to the other.

When the parts are assembled and the operator turns a crank, the pistons9 and 50 will be raised. Assuming that the chambers or cylinders on bothsides of the pistons are supplied with oil, the upward movements orsisting the piston 9 to move the volume of oil from the chamber 12through pipe 34 into the lower portion of the cylinder 35. Then thepiston 50 is moving upwardly, the check valve 36 is obviously closed, asis also the check valve 8. Therefore. it will be seen that as the oil isbeing expelled from the top side of the piston 50, an equal quantity ofoil is being introduced into the lower side of the chamber, that is,below the piston 50. As the crank continues to turn the disk 18, thedirection of movement of the pistons will be reversed through the link16. On the downward strokes of the pistons the check valve 36 will beclosed` the check valve 7 will be closed, oil will be drawn through partof the pipe 5, through pipe 6 and into the chamber 12 because the checkvalve 8 will unseat. The check valve 36 will unseat on the downwardmovement of the piston 9 so that oil will be forced from the chamber 13into the chamber above the piston 50. As the piston 5() moves downward,the valve 43 is unseating so that liquid is being expelled from thecylinder 35 through the conduit 49 into the hose r41. These continuousalternating operations of receiving and expelling the gasoline willcontinue so long as the gearing is operated by the crank.

It will be apparent in view of the foregoing that no lost motion willoccur nor will there be any necessity lfor reversing the rotativemovement yof vthe crank in order to refill the `dispensing chamber, itbeing understood that the cylinder 4lis a supplying .cylinder and thecylinder -35 is a dispensing cylinder, there being two cham-bers' in it,one on each side of the piston 50 and -by way of example, the capacityof the cylinder 35 may be such @that at each rectilineal movement of thepiston, one gallon of gasoline will be discharged from the cylinder 35or two gallons for a complete reciprocaton. Of course, these proportionsare only illustrative as the pump obviously could be made to dischargeany quantity of liquid for a given movement of the piston.

What I claim and desire to secure by Letters-Patent is:

1. In a fluid dispensing device, a transparent dispensing cylinderhaving sets of alternately opening and closing inlet and outlet ports atopposite ends thereof, a piston in the transparent cylinder to indicatethe amount of fluid received in one end of the cylinder and the quantityof fluid remaining in the other end of the cylinder, a supply cylinderhaving communication with a source of supply and discharging into theopposite ends of the first named cylinder, the supply cylinder having apiston therein dividing it into two end spaces, the end space of thesupply cylinder being in series with the end spaces of the dispensingcylinder, means rigidly connecting the two pistons together and a geartrain operable in either direction for operating the pistons.

2. In a fluid dispensing device a dispensing cylinder having sets ofalternately opening and closing inlet and outlet ports at opposite ends,a double acting piston in said cylinder, dividing the cylinder into twocompartments and having movement to discharge measure-d quantities offluid from one compartment when fluid is flowing into the othercompartment and adouble acting pump having connections with oppositeends of the dispensing device to illl the compartment on one side of thepiston when fluid is discharging from the opposite side of the piston.

3. In a fluid dispensing device, a dispensing cylinder having sets ofalternately opening and closing inlet and outlet ports at opposite endsthereof, a double-acting piston in said cylinder having movement todischarge measured quantities of fluid from alternate sides of thepiston during the reciprocatory movements thereof, a supply cylinderhaving communication with a source of supply and discharging intoopposite ends of the first named cylinder, a. piston in the supplycylinder, means for rigidly connecting the two pistons together, andmeans for operating the pistons.

l. In a fluid dispensing device, Aa dispensing .cylinder having .sets ofalternately yopening and closing inlet and outlet ports at oppositevends thereof, a double-acting piston in said cylinder having movementto discharge measured quantities of fluid from lalternate sides of thepiston during the reciprocatory movements thereof, a supply cylinderhaving communication with a source of supply and discharging intoopposite ends of the first named cylinder, a piston in the supplycylinder, means for rigidly connecting the two pistons together, and agear train operable in either direction for operating the pistons.

5. In a fluid dispensing device, a dispensing cylinder having sets ofalternate-ly opening and closing inlet and outlet ports at opposite endsthereof, a double-acting piston in said cylinder having movement todischarge measured quantities of fluid from alternate sides of thepiston during the reciprocatory movements thereof, a supply cylinderhaving communication with a source of supply and discharging intoopposite ends of the first named cylinder, a piston in the supplycylinder, means for rigidly connecting the two pistons together, and agear train including a disk, a pin eccentrically mounted on the disk, alink connected to the pin, and means for connecting one` end of the linkto the connecting means for the pistons whereby a rotative movementimparted to the disk in either direction will cause a reciprocatorymotion of the pistons in unison.

6. In a fluid dispensing device, a pair of cylinders, one of which is afluid supply cylinder and the other a fluid dispensing cylinder, thefluid dispensing cylinder having alternately opening and closing portsat its respective ends, means for connecting the opposite ends of thesupply cylinder to like ends of the dispensing cylinder, pistons in thetwo cylinders, means for connecting them to cause them to work inunison, and means for operating said pistons.

7. In a fluid dispensing device, a pair of cylinders, one of which is afluid supply cylinder and the other a fluid dispensing cylinder, thefluid dispensing cylinder having alternately opening and closing portsat its respective ends, means for connecting the opposite ends of thesupply cylinder to like ends of the dispensing cylinder, pistons in thetwo cylinders, means for connecting them to cause them to work inunison, and a gear train operatively connected to the piston connectingmeans and so associated therewith that the pistons will be reciprocatedwhen the gear train is opera-ted in either direction.

8. In a `fluid dispensing device a pair of cylinders, one of which is apumping cylinder and the other a fluid dispensing cylinder, the fluiddispensing cylinder having alternately opening and closing ports in itsrespective ends connected to a common outlet, the dispensing cylindercommunicating at its respective ends With the pump and a reciprocatorypiston in the dispensing cylinder movable to vary fluid compartments onopposite sides thereof, so that the c0mpart- 10 ment on one side of thepiston Will belenlarging to take in fluid When the compartment on theother side of the piston is contracting to dispense fluid and means as#sociated With the pump for fee-ding fluid into the dispensing cylinderat a rate to maintain the enlarging chamber filled during the movementof the piston in the dispensing cylinder.

In testimony whereof I affix my signature.

- A G MCGALIN.

